Line Angle Triangle

an endless straight path with no end points

• ray

• line segment

• angle

• line

a triangle with one right angle

• acute triangle

• right triangle

• obtuse triangle

• scalene triangle

A triangle with three congruent sides

• scalene triangle

• right triangle

• isosceles triangle

• equilateral triangle

an angle that measures 180 degrees

• right angle

• obtuse angle

• acute angle

• straight angle

Right, acute, or obtuse?

• Right

• Acute

• Obtuse

Identify the triangle where one angle is exactly 90 degrees.

• Scalene triangle

• Isosceles triangle

• Right triangle

• Equilateral triangle

Which triangle has two angles of the same measure?

• Scalene triangle

• Isosceles triangle

• Right triangle

• Equilateral triangle

The measurements of interior angles of a triangle add up to 180º. Triangle ABC is a right triangle with a right angle at vertex A. What must be true of the angles at vertex B and vertex C ?

• The angles at vertex B and vertex C are both acute.

• The angles at vertex B and vertex C are equal.

• The angles at vertex B and vertex C are both right.

• The angles at vertex B and vertex C add up to 90º.

• 84º

• 26º

• 36º

• 74º

• 100º

• 24º

• 34º

• 36º